Bugfix: in VCL set the backend in the "grace-hit" case.

Otherwise no backend is set for background fetches.

pkg/varnish/vcl/rewrite_test.go

@@ -733,10 +733,8 @@ func TestRewriteDeleteAuth(t *testing.T) {
 		t.Fatal("WriteFile():", err)
 	}
 	if !bytes.Equal(goldbytes, []byte(src)) {
-		t.Fatalf("Generated VCL does not match gold file: %s", gold)
-		if testing.Verbose() {
-			t.Logf("Generated: %s", src)
-		}
+		t.Fatalf("Generated VCL does not match gold file: %s\n%s", gold,
+			src)
 	}
 }
 

pkg/varnish/vcl/testdata/backendcfg.golden

@@ -182,3 +182,10 @@ sub vcl_pass {
 sub vcl_pipe {
 	call vk8s_set_backend;
 }
+
+sub vcl_hit {
+	if (obj.ttl < 0s) {
+		# Set a backend for a background fetch.
+		call vk8s_set_backend;
+	}
+}

pkg/varnish/vcl/testdata/custom_vcl.golden

@@ -92,6 +92,13 @@ sub vcl_pass {
 sub vcl_pipe {
 	call vk8s_set_backend;
 }
+
+sub vcl_hit {
+	if (obj.ttl < 0s) {
+		# Set a backend for a background fetch.
+		call vk8s_set_backend;
+	}
+}
 sub vcl_deliver {
 	set resp.http.Hello = "world";
 }
\ No newline at end of file

pkg/varnish/vcl/testdata/ingress_shard.golden

@@ -93,6 +93,13 @@ sub vcl_pipe {
 	call vk8s_set_backend;
 }
 
+sub vcl_hit {
+	if (obj.ttl < 0s) {
+		# Set a backend for a background fetch.
+		call vk8s_set_backend;
+	}
+}
+
 import std;
 import directors;
 

pkg/varnish/vcl/testdata/ingressrule.golden

@@ -92,3 +92,10 @@ sub vcl_pass {
 sub vcl_pipe {
 	call vk8s_set_backend;
 }
+
+sub vcl_hit {
+	if (obj.ttl < 0s) {
+		# Set a backend for a background fetch.
+		call vk8s_set_backend;
+	}
+}

pkg/varnish/vcl/testdata/rewrite_auth_delete.golden

@@ -34,6 +34,13 @@ sub vcl_pipe {
 	call vk8s_set_backend;
 }
 
+sub vcl_hit {
+	if (obj.ttl < 0s) {
+		# Set a backend for a background fetch.
+		call vk8s_set_backend;
+	}
+}
+
 import re2;
 
 sub vcl_init {

pkg/varnish/vcl/vcl.tmpl

@@ -158,3 +158,10 @@ sub vcl_pass {
 sub vcl_pipe {
 	call vk8s_set_backend;
 }
+
+sub vcl_hit {
+	if (obj.ttl < 0s) {
+		# Set a backend for a background fetch.
+		call vk8s_set_backend;
+	}
+}